长兴岛邻近海域的沉积物粒度参数特征及对底床动力环境反演

Characteristics of sediment grain size and their implication for near bed hydrodynamic environment in Changxing Island and adjacent area

采用传统法分析了长兴岛及邻近海域11个表层沉积物样品的粒度参数。基于沉积物粒度参数的分析,反演了区域的水动力环境,结果表明表层沉积物平均粒径和分选系数的变化方向指示的长时间尺度下的沉积物输运格局较为一致,砾石、极粗砂和粗砂含量5%的等值线以及极细砂和粉砂含量20%的等值线分布较好的推测了长兴岛区域近底床优势流速。

11surficial sediment samples in Changxing Island and the adjacent area were selected and analyzed by the traditional grain size analysis method.Based on sediment grain size characteristics,the hydrodynamic environment was estimated in the sea area.The results showed that the attenuation of sediment average grain size and sorting coefficient showed the same transporting direction.The 5% content of gravel,very coarse sand and coarse sand,and 20% very fine sand and silt may be the prevailing direction and velocity of bottom current successfully.